1. Warm-Up 4/5/17 and 4/6/17 What is an invasive species?
Describe the different ways in which invasive species arrive in a new area.
How can invasive species affect native populations?
Describe an example of mutualism.
Describe an example of commensalism.

2. Where we have been… Where we are going…
Ecology is the study of how organisms interact with each other AND their environment.
We have focused on interactions with each other
Predator/prey
Energy flow
Competition and Invasive Species
Symbiosis
Now we will focus on interactions with their environment.

3. Activation Video: HOW WOLVES CHANGE RIVERS
Case Study: How Wolves Change Rivers

4. Objective: I will be able to describe how resource availability affects populations as evidenced by analyzing and interpreting the data from the “Oh Deer” Lab.
Resource Availability
and
Pg. 81

5. How Many Organisms can be Sustained in an Ecosystem?
Limiting Factors:
Biotic and abiotic factors that prevent the continuous growth of a population

6. Carrying Capacity
Carrying Capacity is the total amount of organisms that can be sustained in an ecosystem (Average of high and low values).
What is this amount determined by?
The amount of resources that are available!

8. What are Resources?
A resource is something that is used to satisfy the requirements of organisms.
EX: Water, Food, Shelter, space

9. Water – Our Most Important Resource!
Cooking
Washing
Use large amounts for:
Agriculture
Manufacturing
Mining
Energy production
Waste disposal
Use of freshwater is increasing

10. Distribution of Water Only 2.5% of water on earth is freshwater
2% is in the form of ice!
Only ~0.5% of water on earth is available freshwater

11. Colorado River bed in Mexico
How do you think it affect the ecosystem?

12. Water Problems
It is unevenly distributed and some places lack stable runoff
Animals in nature are greatly impacted
Problems:
Climate Change
type and distribution of precipitation (rain)
Creeks and streams dry up, therefore less water for organisms to drink; populations die off
Sea level rising will cause saltwater intrusion into drinking water supplies
Population Growth
Increase in population means an increase in freshwater requirements
Limits drinking water available

13. Food What an organism consumes for energy
Humans, other animals, and environmental conditions can alter what is available
Competition
Invasive species
Hunting
Fishing
Natural disasters

14. Shelter/Habitat
Where a organism lives; space available for a population to live
Human activities play a large role in altering shelter availability
Development
Damming rivers
Clear-cutting forests

15. Sometimes humans use resources from nature…
Can you think of examples?
Is there a way to categorize these resources?

16. Renewable vs. Nonrenewable Resources
A natural resource that cannot be re-made or re-grown at a scale comparable to its use.
We use it faster than it can be re-made
Examples: nuclear energy, coal, petroleum, and gas
A natural resource that can be replenished in a short period of time.
Often a resource renews so fast that it will have regenerated by the time you have used it up.
Examples: solar, geothermal, wind, biomass, water

17. TWIG Twig: Resources

18. Analysis Questions
Name 3 essential components of a habitat (things animals need)
What caused an increase in deer during the activity?
What caused a decrease in deer during the activity?
Explain why wildlife populations never stay the same but are continually changing?